Improvement in valve-gear for steam-engines



UNITED STATES PATENT OEEICE.

CHAPMAN E. GAGE, OF VVINONA, MINNESOTA, ASSIGNOR TO COLUMBIA DREW, -OF SAME PLACE.

IMPROVEMENT lN VALVE-GEAR FOR STEAM-ENGINES.

Specification forming part of Letters Patent N0. 47,492, dated April 25, 1865.

To all whom t may concern:

Be it known that I, CHAPMAN E. GAGE, of the city and county of Winona, in the State of Minnesota, have invented a ne\v and useful Improvement in Cnt-Offs for Steam-Engines; arid I do hereby declare the following to be a fill and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in Which- Figure 1 is a perspective view of a steamcylinder and appurtenances including Iny improved cut-off. Fig. 2 is a similar view taken f 'om the opposite side.

Similar letters of reference indicate corresponding parts in the two figures.

This invention relates to an apparans for regulating the supply and exhaust of steam in the cylinders of steam-engines; and it consists in adapting the yohes or valve-rods to constitute supports and guides for the reciprocating bar or cross-head, which receives motion from the piston rod and acts to open and close the proper induction and exhaust ports at each stroke, as will be hereinafter eX- pained.

ln order that others skilled in the art to which inyiuvention appertainsmay be enabled to fully understand and use the same, I will proceed to describe its construction and operation.

In the accompanying drawings, l repres )nts the steam-cylinder, and 2the steam-chest-,into which latter steam is conducted from the boiler through a pipe, whose end is received or ins Irted at the hoe 3.

O X,Figure1, representtheinduction-ports, and 15,15, Fig. 2, the exhaust-ports.

In Fig. l, 4 4 represent the valves ot' the induction-ports O X, Which valves are attached to the respective ends of one of the rods 14 and guided during their movement in suitable apertures in the ends of the steam chest 2.

4X 4X may represent the valves of the exhaustports, also attached to the ends of one of the rods 14 and guided in the boxes 2X 2%.

7 represents a bar placed transversely7 rel atively to the cylinder 1, and joined to a crooked arm, 6, which is connected to and moves with the pistonrod 8. As thepisttn is driven back and forth in `the cylinder, the bar 7 undergoes a corresponding movement and slides upon the valverods 14 14. Near one end the latter are formed with shoulders 5 5, and near the other end with shoulders 13 13. The bar 7 in its reciprocating.movement comes in contact with the shoulders 5 and 13 alternately. The valves 4 4X structed and arranged that the movement which the valve rods 14 14 receive when the bar 7 is moving in contact with the shoulders 5 will cause said valves to assume such positions as to open the induction-port O and eX- haust-port 18, and close the induction-port X and exhaust-port 15. On its return move ment the bar 7 strikes the shoulders 13 on the valve-rods 14 14, and the latter -with their vulves are now moved in the opposite direc tion from that just spoken of, the result ot' which is the opening ot' the induction-portX and exhaust port 15 and closing of the indue tion-port O and exhaust-port 18. The crosshead of the piston-rod 8 works on guideways 9 9 in customary manner.

The above arrangement is simple and cheap in construction and will be found very eicetive in practical operation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, :is-

The sliding-valve rods 14 v14, constituting supports and guides for the bar 7,1Which imparts movementto the valve-rods by coming in contact with theshoulders 5 13, and thus effects the alternate openingand closing of the proper induction and exhaust ports.

CHAPMAN E. GAGE.

Witnesses: A

M. I. BUNDY, t RICHARD G. CHAPIEL. 

